Malicious PDF — malware analysis report

Static analysis result for SHA-256 963eb1bf66ddb33a…

MALICIOUS

PDF

86.2 KB Created: 2021-07-06 21:26:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8620b2eb8a8d1b233cb6e444a624dea8 SHA-1: 80a1a9e97094cbe30de7f9c4ecb4f6d8a9af7f65 SHA-256: 963eb1bf66ddb33a6b1e0f2b35c813099db88a9dd9bad7dd03e911ad65371bbe
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://vce34.ru/attachments/file/firoseluxosaluzete.pdf In PDF document text
    • http://bigpictureresources.com/userfilesbigpicture/file/lutifexufurobiduvavarot.pdfIn PDF document text
    • http://auchli-appenzeller.ch/userfiles/files/65655731679.pdfIn PDF document text
    • http://mackyz7automotive.com/js/upload/files/51087347651.pdfIn PDF document text
    • http://artpolinakuzina.ru/pict/file/40842698921.pdfIn PDF document text
    • https://zlatartopalovic.rs//files/ditojizonalufixoxunafe.pdfIn PDF document text
    • https://peterdegendt.be/file/pofisimonureloxikiw.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/6928f1c3a9c0ff29f711071fcb043c24/wilepikezogunil.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160835cadd31fa---79361764422.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/160728f54b5f98---57094297833.pdfIn PDF document text
    • https://encoregallery.us/wp-content/plugins/super-forms/uploads/php/files/0fa184b533d8c78a5b35b30d86c4db5a/pubinalorav.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/cda7cf96e5e4ddc560ad5a80245d12c6/vepameruduvaf.pdfIn PDF document text
    • http://emailreceptionist.net/userfiles/file/58232944273.pdfIn PDF document text
    • http://stellamaris.cz/userfiles/lubuzawemipolubon.pdfIn PDF document text
    • http://panda-es.tokyo/yamituki-n/uploads/files/vepovokasawujagava.pdfIn PDF document text
    • http://www.srijonihealinghome.com/fckimages/file/wexalani.pdfIn PDF document text
    • http://mt-filtration.com/uploaded/file/148555282060da6d8bafa74.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/7bb73e3d501876c9fd56ecf993696f8d/zemigijawujapurodorukur.pdfIn PDF document text
    • http://accessprecision.com/userfiles/file/44340791382.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/96098419568.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607443f865b0f---noreno.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607117f4af51d---givipud.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c6dc460e795---lisewop.pdfIn PDF document text
    • http://mobydick-band.de/fckdata/file/85329734897.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160741c2eebf98---60168487263.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=how+to+tame+a+polar+bear+in+minecraft+pePDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000edf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF1 10688 bytes
SHA-256: 3fdd0ee5346f58037e68fc4787c855b9676a46c4e7da25d9101c388e2cccc6e9
font_01_sfnt_off0001062a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1062A 17432 bytes
SHA-256: 6f319178fa8bba15b4eeea67b2c95c86319df257498ac1c897e642842720c6fa
font_02_sfnt_off00013323.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13323 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1